Abstract
Periampullary adenocarcinoma (PAC) is defined as tumors arising ≤2 cm from the ampulla of Vater and can originate from the pancreatic head, duodenum, distal bile duct, or ampulla of Vater. All four subtypes of PAC typically present with obstructive jaundice but have variable survival rates depending on site and specific histology. Pancreas protocol computed tomography (CT) scan is the most useful imaging modality for PACs, and surgical resection offers the best chance of cure. Proceeding to surgery based on pancreas protocol CT findings alone is acceptable, but certain clinical scenarios may require further preoperative workup with biliary drainage procedures or tissue diagnosis. The standard procedure for PAC is pancreaticoduodenectomy (PD) with the goal of complete tumor resection with negative oncologic margins. Clinicopathologic staging is based on the American Joint Committee on Cancer (AJCC) Cancer Staging Manual for each location of PAC origination. Key factors in staging and adjuvant treatment are resection margins, nodal involvement, microvascular invasion, and perineural invasion. Features important for chemotherapy and immunotherapy include histomolecular markers such as key results areas (KRAS) and ductal pancreatic adenocarcinoma (DPAC) that offer opportunity for targeted therapy. Multidisciplinary oncologic care for PAC is essential along the continuum of treatment.
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Keywords
- Periampullary carcinoma
- Ampullary carcinoma
- Distal bile duct carcinoma
- Duodenal adenocarcinoma
- Pancreatic ductal adenocarcinoma
- Pancreas protocol computed tomography scan
- Pancreaticoduodenectomy
- Biliary drainage procedure
- Neoadjuvant therapy
- Adjuvant therapy
Algorithmic Approach
Periampullary adenocarcinoma (PAC) is a clinicopathologic entity comprised of four distinct subtypes in one high-density anatomic region. Formally defined as tumors arising ≤2 cm from the ampulla of Vater, PAC can originate from the pancreatic head, duodenum, distal bile duct, or ampulla of Vater [1]. Pancreatic ductal adenocarcinoma (PDAC) is the most common PAC with a recent longitudinal study demonstrating its occurrence at 66% compared to 16%, 12%, and 6% for ampullary, biliary, and duodenal adenocarcinoma s, respectively [2]. Though not a common tumor type, PAC has low overall survival rates that differ significantly by location of origination [3]. To illustrate, one series reported primary site-specific 5-year PAC survival rates of only 17% for pancreas, 23% for bile duct, 37% for ampulla, and 51% for duodenum [4]. The high and variable mortality of PAC is likely attributable to stage at presentation and inherent biologic differences in pancreatobiliary versus intestinal histology [1, 5].
Diagnosis and Preoperative Evaluation
-
A.
Patients most frequently present with obstructive jaundice possibly accompanied by vague abdominal pain, nausea, and weight loss [6]. PAC should always be considered when evaluating a patient with obstructive jaundice, and basic workup of laboratory studies including liver function tests (LFTs), cancer antigen 19-9 (CA 19-9), carcinoembryonic antigen (CEA), and cross-sectional imaging should be obtained [6,7,8]. A multidetector spiral computed tomography scan with intravenous contrast performed in both the arterial and portal venous phase (pancreas protocol CT) is ideal to evaluate for a periampullary mass [7]. Findings on pancreas protocol CT are critically important to determining the next steps in the patient’s management.
-
B.
Recent advances in radiographic technology now facilitate assessment of many preoperative staging factors necessary to determine resectability of a periampullary mass, including involvement of mesenteric vessels [9].
Resection and Clinicopathologic Staging
As surgical resection remains the best chance of cure for PACs, the time from identification of the mass to operation should be optimized [2]. Proceeding to surgery based on pancreas protocol CT findings alone is acceptable, but the clinical scenario may require further workup [7].
-
C.
Biliary drainage procedure s are typically recommended only in cases of cholangitis, substantially elevated bilirubin, or prolonged period of elevated bilirubin [10, 11]. Preoperative tissue diagnosis is not necessary if there is a high index of suspicion for cancer on cross-sectional imaging and immediate operative intervention is planned. However, tissue diagnosis is necessary if neoadjuvant therapy is considered, as is frequently the case for PDAC [12, 13].
-
D.
The standard procedure for PAC is pancreaticoduodenectomy (PD) with the goal of complete tumor resection with negative oncologic margins [2]. Full descriptions of the operative technique and complications of PD are out of the scope of this chapter. Clinicopathologic staging is based on the American Joint Committee on Cancer (AJCC) Cancer Staging Manual for each location of PC origination [14]. Key factors are resection margins, nodal involvement, microvascular invasion, and perineural invasion [14].
-
E.
As chemotherapy and immunotherapy continue to improve for PAC, further important features are histomolecular markers such as KRAS and DPAC that are more prevalent in PDAC and offer opportunity for targeted therapy [15]. Multidisciplinary oncologic care is essential along the continuum of treatment [16].
Conclusion
PAC consists of pancreatic, biliary, ampullary, and duodenal carcinoma which all present with similar symptoms but have variable survival rates depending on site and specific histology. Pancreas protocol CT scan is the most useful imaging modality, and surgical resection with pancreaticoduodenectomy offers the best chance for cure.
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Overton, H.N., Weiss, M.J. (2019). Periampullary Carcinoma. In: Docimo Jr., S., Pauli, E. (eds) Clinical Algorithms in General Surgery . Springer, Cham. https://doi.org/10.1007/978-3-319-98497-1_98
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DOI: https://doi.org/10.1007/978-3-319-98497-1_98
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